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Electrical Principles Jim Jenneson 7th Edition- Test Bank
Sample Questions
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Chapter 08
Testbank
Multiple Choice Questions
| 1. |
The type of units of measurement, mathematical processes and simple mechanics used by electricians is:
| A. |
metric Standard International units |
| B. |
British imperial units |
| C. |
American imperial units |
| D. |
furlong/firkin/fortnight units |
|
| 2. |
Base units are not formed from other units, although the SI system defines them as having specific dimensions which are derived from:
|
| 3. |
The maths used by electricians works with:
| A. |
base units and the integral units |
| B. |
base units and the large units |
| C. |
base units and the small units |
| D. |
base units and the derived units |
|
| 4. |
The length of a prototype platinum bar stored in France at standard temperature and pressure, is exactly:
|
| 5. |
Weight is the force caused by:
| D. |
the torque of the body |
|
| 6. |
Candela (cd) is defined as:
| A. |
the luminous efficiency in a given direction of a source |
| B. |
the luminous density in a given direction of a source |
| C. |
the luminous flux in a given direction of a source |
| D. |
the luminous intensity in a given direction of a source |
|
| 7. |
1 radian (rad) is equal to:
| A. |
360° divided by 2π or ~57.3° |
| B. |
300° divided by 3π or ~56.3° |
| C. |
320° divided by 2π or ~59.3° |
| D. |
380° divided by 4π or ~58.3° |
|
| 8. |
Time is now synchronised to:
| A. |
physical clocks around the world |
| B. |
Russian clocks around the world |
| C. |
atomic clocks around the world |
| D. |
American clocks around the world |
|
| 9. |
Which unit is used in defining the radiation of light and other radiating quantities?
| B. |
Angular area—the steradian |
| C. |
Plane angle—the radian |
| D. |
None of the given answers is correct |
|
| 10. |
There are many more derived units described in:
|
| 11. |
A coulomb is the quantity of electric charge that is nominally equal to:
|
| 12. |
A newton (N) is the force which causes an acceleration of 1 metre per second when applied to:
|
| 13. |
A force of 1 newton applied to an area of 1 square metre is the:
|
| 14. |
When a force of 1 newton is applied to a mass, causing it to move a distance of 1 metre:
| A. |
the work done (or energy saved) is 1 kW (kilowatt) |
| B. |
the work done (or energy expended) is 1 W (watt) |
| C. |
the work done (or energy saved) is 1 J (joule) |
| D. |
the work done (or energy expended) is 1 J (joule) |
|
| 15. |
The power used when energy is expended at the rate of 1 J per second is:
|
| 16. |
A hertz (Hz) is the number of periodic:
| A. |
oscillations per minute |
| C. |
oscillations per second |
| D. |
oscillations per micro second |
|
| 17. |
The weber (Wb) was once defined as:
| A. |
a unit of 180 lines of force |
| B. |
a unit of 118 lines of force |
| C. |
a unit of 18 lines of force |
| D. |
a unit of 108 lines of force |
|
| 18. |
The magnetic flux density of 1 weber per square metre is:
|
| 19. |
The magnitude of the number is converted into an exponent, and the value of the number is expressed with:
| A. |
two digits before a decimal place |
| B. |
five digits before a decimal place |
| C. |
one digit before a decimal place |
| D. |
three digits before a decimal place |
|
| 20. |
one giga (G) is equal to:
|
| 21. |
Transposition is used when the maths is:
| D. |
None of the given answers is correct |
|
| 22. |
Work can also be described as the process of converting:
| A. |
molecules from one form into another |
| B. |
energy from one form into another |
| C. |
power from one form into another |
| D. |
work from one form into another |
|
| 23. |
A force of 100 N is required to move a box 3 m along a horizontal surface. Find the value of work done.
|
| 24. |
In mechanical machines where the movement is of a rotational type, the distance covered depends on the:
| B. |
radius as well as the speed of rotation |
| D. |
None of the given answers is correct |
|
| 25. |
Power is calculated directly from:
| A. |
the constant speed (n) multiplied by the number of radians in a circle (2π) and torque (T) |
| B. |
the rotational speed (n) divided by the number of radians in a circle (2π) and torque (T) |
| C. |
the constant speed (n) divided by the number of radians in a circle (2π) and torque (T) |
| D. |
the rotational speed (n) multiplied by the number of radians in a circle (2π) and torque (T) |
|
| 26. |
Rotational speed is often given as:
| A. |
rpm (r/min) and rad.s−1 |
| C. |
rpm (r/min) rather than rad.s−1 |
| D. |
rph (r/hour) rather than rad.s−1 |
|
| 27. |
A force of 150 N is applied to the end of a spanner 0.4 m long to tighten a nut. Calculate the torque applied to the nut:
|
| 28. |
Find the torque exerted by a 3kW electric motor operating at 1440 rpm.
|
| 29. |
If a device has a power input of 160 W and a power output of 120 W, find the efficiency and the loss (W).
|
| 30. |
Find the efficiency of the electric motor in Question No. 27 if the losses are found to be 357 W.
|
| 31. |
The terms ‘scalar’ and ‘vector’ are used when thinking of mechanical quantities, but:
| A. |
these quantities also occur in chemical theory |
| B. |
these quantities also occur in electrical theory |
| C. |
these quantities also occur in newton theory |
| D. |
these quantities also occur in mathematical theory |
|
| 32. |
The quantities which have magnitude but no direction are called:
| D. |
None of the given answers are correct |
|
| 33. |
The quantities which must be expressed in both magnitude and direction are called:
| D. |
None of the given answers are correct |
|
| 34. |
Vectors, when applied to electrical systems, are called:
|
| 35. |
Scalar quantities may be drawn as a:
| A. |
parabola proportional to their magnitude |
| B. |
straight line proportional to their magnitude |
| C. |
elliptical proportional to their magnitude |
| D. |
straight line inversely proportional to their magnitude |
|
| 36. |
Vector quantities acting in the same direction can also be treated as:
|
| 37. |
The unit ‘kilogram’ is used to measure:
|
| 38. |
The resultant value of two forces acting on a body depends on the:
| A. |
torque between the directions of the forces, as well as their respective magnitudes |
| B. |
angle between the directions of the forces, as well as their respective magnitudes |
| C. |
angle between the directions of the torque, as well as their respective magnitudes |
| D. |
angle between the directions of the speed, as well as their respective magnitudes |
|
| 39. |
The forces are in opposition and the resultant force is F1 − F2 which will act in the direction of:
|
| 40. |
Two forces (F1 and F2), each of 25 N, act at right angles to each other on a body. Determine the value of the resultant force (FR) acting on the body.
|
| 41. |
In which method are the two forces drawn to scale from a point of application in the direction of application?
| A. |
The vector polygon method |
| B. |
The parallelogram method |
|
| 42. |
Which method is also known as the ‘graphical’ or ‘vector diagram method’?
| A. |
The vector polygon method |
| D. |
The parallelogram method |
|
| 43. |
Which method requires each vector to be drawn to scale and angle with its origin at the end of the previous vector?
| A. |
The vector polygon method |
| B. |
The parallelogram method |
|
| 44. |
A vector has magnitude and direction (angle) and is usually written in:
|
| 45. |
Once the sum of the horizontal and vertical forces is known, they can be combined using:
|
| 46. |
Trigonometry is based on the measurements of:
|
| 47. |
Which triangle has different sizes and have different lengths of sides, but the angles remain constant?
|
| 48. |
In any right angle triangle, hypotenuse is the:
|
| 49. |
In any right angle triangle, the side nearest a given angle is called the:
| D. |
None of the given answers are correct |
|
| 50. |
In any right angle triangle, the side furthest from a given angle is called the:
| D. |
None of the given answers are correct |
|
Chapter 08 Testbank Answer Key
Multiple Choice Questions
| 1. |
The type of units of measurement, mathematical processes and simple mechanics used by electricians is:
| A. |
metric Standard International units |
| B. |
British imperial units |
| C. |
American imperial units |
| D. |
furlong/firkin/fortnight units |
|
Section: 8.0 Introduction
|
| 2. |
Base units are not formed from other units, although the SI system defines them as having specific dimensions which are derived from:
|
| 3. |
The maths used by electricians works with:
| A. |
base units and the integral units |
| B. |
base units and the large units |
| C. |
base units and the small units |
| D. |
base units and the derived units |
|
| 4. |
The length of a prototype platinum bar stored in France at standard temperature and pressure, is exactly:
|
| 5. |
Weight is the force caused by:
| D. |
the torque of the body |
|
| 6. |
Candela (cd) is defined as:
| A. |
the luminous efficiency in a given direction of a source |
| B. |
the luminous density in a given direction of a source |
| C. |
the luminous flux in a given direction of a source |
| D. |
the luminous intensity in a given direction of a source |
|
| 7. |
1 radian (rad) is equal to:
| A. |
360° divided by 2π or ~57.3° |
| B. |
300° divided by 3π or ~56.3° |
| C. |
320° divided by 2π or ~59.3° |
| D. |
380° divided by 4π or ~58.3° |
|
| 8. |
Time is now synchronised to:
| A. |
physical clocks around the world |
| B. |
Russian clocks around the world |
| C. |
atomic clocks around the world |
| D. |
American clocks around the world |
|
| 9. |
Which unit is used in defining the radiation of light and other radiating quantities?
| B. |
Angular area—the steradian |
| C. |
Plane angle—the radian |
| D. |
None of the given answers is correct |
|
| 10. |
There are many more derived units described in:
|
| 11. |
A coulomb is the quantity of electric charge that is nominally equal to:
|
Section: 8.3 SI derived units
|
| 12. |
A newton (N) is the force which causes an acceleration of 1 metre per second when applied to:
|
Section: 8.3 SI derived units
|
| 13. |
A force of 1 newton applied to an area of 1 square metre is the:
|
Section: 8.3 SI derived units
|
| 14. |
When a force of 1 newton is applied to a mass, causing it to move a distance of 1 metre:
| A. |
the work done (or energy saved) is 1 kW (kilowatt) |
| B. |
the work done (or energy expended) is 1 W (watt) |
| C. |
the work done (or energy saved) is 1 J (joule) |
| D. |
the work done (or energy expended) is 1 J (joule) |
|
Section: 8.3 SI derived units
|
| 15. |
The power used when energy is expended at the rate of 1 J per second is:
|
Section: 8.3 SI derived units
|
| 16. |
A hertz (Hz) is the number of periodic:
| A. |
oscillations per minute |
| C. |
oscillations per second |
| D. |
oscillations per micro second |
|
Section: 8.3 SI derived units
|
| 17. |
The weber (Wb) was once defined as:
| A. |
a unit of 180 lines of force |
| B. |
a unit of 118 lines of force |
| C. |
a unit of 18 lines of force |
| D. |
a unit of 108 lines of force |
|
Section: 8.3 SI derived units
|
| 18. |
The magnetic flux density of 1 weber per square metre is:
|
Section: 8.3 SI derived units
|
| 19. |
The magnitude of the number is converted into an exponent, and the value of the number is expressed with:
| A. |
two digits before a decimal place |
| B. |
five digits before a decimal place |
| C. |
one digit before a decimal place |
| D. |
three digits before a decimal place |
|
Section: 8.3 SI derived units
|
| 20. |
one giga (G) is equal to:
|
Section: 8.3 SI derived units
|
| 21. |
Transposition is used when the maths is:
| D. |
None of the given answers is correct |
|
Section: 8.4 Transposition
|
| 22. |
Work can also be described as the process of converting:
| A. |
molecules from one form into another |
| B. |
energy from one form into another |
| C. |
power from one form into another |
| D. |
work from one form into another |
|
Section: 8.5 Energy, work and power
|
| 23. |
A force of 100 N is required to move a box 3 m along a horizontal surface. Find the value of work done.
|
Section: 8.5 Energy, work and power
|
| 24. |
In mechanical machines where the movement is of a rotational type, the distance covered depends on the:
| B. |
radius as well as the speed of rotation |
| D. |
None of the given answers is correct |
|
Section: 8.5 Energy, work and power
|
| 25. |
Power is calculated directly from:
| A. |
the constant speed (n) multiplied by the number of radians in a circle (2π) and torque (T) |
| B. |
the rotational speed (n) divided by the number of radians in a circle (2π) and torque (T) |
| C. |
the constant speed (n) divided by the number of radians in a circle (2π) and torque (T) |
| D. |
the rotational speed (n) multiplied by the number of radians in a circle (2π) and torque (T) |
|
Section: 8.5 Energy, work and power
|
| 26. |
Rotational speed is often given as:
| A. |
rpm (r/min) and rad.s−1 |
| C. |
rpm (r/min) rather than rad.s−1 |
| D. |
rph (r/hour) rather than rad.s−1 |
|
Section: 8.5 Energy, work and power
|
| 27. |
A force of 150 N is applied to the end of a spanner 0.4 m long to tighten a nut. Calculate the torque applied to the nut:
|
Section: 8.5 Energy, work and power
|
| 28. |
Find the torque exerted by a 3kW electric motor operating at 1440 rpm.
|
Section: 8.5 Energy, work and power
|
| 29. |
If a device has a power input of 160 W and a power output of 120 W, find the efficiency and the loss (W).
|
Section: 8.5 Energy, work and power
|
| 30. |
Find the efficiency of the electric motor in Question No. 27 if the losses are found to be 357 W.
|
Section: 8.5 Energy, work and power
|
| 31. |
The terms ‘scalar’ and ‘vector’ are used when thinking of mechanical quantities, but:
| A. |
these quantities also occur in chemical theory |
| B. |
these quantities also occur in electrical theory |
| C. |
these quantities also occur in newton theory |
| D. |
these quantities also occur in mathematical theory |
|
Section: 8.6 Scalar and vector quantities
|
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